This guy

Ok solid thanks guys so what exactly is the tool called? Also if I were to get this done at a shop approximately how much would this cost?

X3xMONGOOSEx3X

I guess you're That guy.

xring

Helicoil is one way of doing it. Sometimes you can get to the spark plug hole while the head is still on the engine, sometimes you can't. Here is how it works, pretty easy.
http://www.popularmechanics.com/cars...repair/4212608

Or Youtube videos, for example:
http://www.youtube.com/watch?v=mHCv0xmeLHg

This is why you should always put a small dab of anti-seize on spark plugs when they are in aluminum heads. Keeps the (steel) threads of the plug from welding to the aluminum. You can remove the plug with enough force, but it will pull the aluminum threads out with it. Also some aluminum heads are very torque-sensitive about plug installation. Always use a torque wrench.

I would think a shop could do it in-car for an hour of shop time plus maybe $50 for the tool and materials. Assuming it can be done with the head in-place.

Good luck! Hope it helps.

moosestang

How were you reinstalling the plugs? Did you use a piece of hose to insert and turn the plug? I've always started new plugs this way on everything and never have I cross threaded one. Don't use a socket to start the plug. Was the motor warm or cold?

Or did you strip it by over torquing it? Just trying to help you figure out why it happened, so it won't happen again.

This guy

I understand thanks for the help everone and moosestang I didnt do that specific plug it actually was my friend installing it While i was checking thre gap on the other plugs and I beleive he put the plug in at the wrong angle and thats how the threads got stripped.

BTW I just called the ford dealer and he said best scenario it could cost $160 and worst case scenario it could cost $800 if they have to remove the head does this seem fair or should i look somewhere else?